Grooved can coiler having pivotable sliver cutting blade

ABSTRACT

A can coiler with an outlet channel for a sliver is provided, whereby the outlet channel is fastened to a turn table and follows a circular path. Calender rolls for transporting the sliver are arranged before the outlet channel. A stationary sliver cutting device with a cutting element is provided, whereby the cutting element is pivotable, transverse to a longitudinal direction of the sliver, into and away from the circular path of the outlet channel into and away from a transverse groove of the turntable. The cutting element is in the form of a cutting knife with a blade and is supported such that a cutting edge for a cutting process by a pulling cutting action is moved into the circular path whereby the cutting knife, in a cutting position thereof, extends to a radial line of the circular path. The radial line is essentially vertical to the cutting edge. The cutting device ensures a flawless operation, even at high production speeds.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a can coiler having an outlet channelfor a sliver that is fastened to a turntable or turning ring and followsa circular path whereby calender rolls are disposed before the outletchannel that serve for transporting the sliver. The can coiler is alsoprovided with a stationary sliver cutting device which is provided witha cutting element that is supported in a pivotable manner and isinsertable into and retractable from the circular path of the outletchannel in a direction transverse to the longitudinal direction of thesliver.

2. Description of the Related Art

A can coiler of the aforementioned kind is known from DE-OS 28 21 325.The cutting element is provided in the form of a comb. The comb isguided by a rotary magnet and is inserted into the sliver channel in thearea of the so called funnel wheel, whereby the sliver channel isprovided with a horizontally arranged slot. The sliver which is alsocalled slubbing is essentially torn apart in a manner causingunraveling. The full width of the sliver essentially contacts therespective "obstacle". This has effects on the quality, especially onthe uniform structure of the sliver, since the sudden pull istransmitted in a jerky manner into the feeding area. The density of thesliver is thus negatively influenced. Due to the unraveling of thesliver the sliver channel is easily plugged. A cutting device of theaforementioned kind, viewed from the perspective of a gentle and carefulcutting, is thus not satisfactory. Furthermore, the cutting device isalso disadvantageous with respect to its construction because the slivercutting device is arranged above the stock head. This results in a spacedemanding superstructure that limits access especially for cleaningpurposes. A sliver cutting device is known from U.S. Pat. No. 3 354 513in which the cutting element is provided in the form of scissors. Sinceit is required today that the can coiler exchange takes place at fullproduction speed, the U.S. Pat. No. 3 354 513 does not fulfill theserequirements. During an exchange at full production speed 10 to 20meters of sliver are placed between the can. With this device, thecutting plane is also arranged transverse to the feed direction of theslubbing. One of the sheer blades is stationary and the sliver is passedthrough underneath The other shear blade is arranged in a pivotablemanner with respect to the first sheer blade. The effects of the cuttingstep should be as disadvantageous as described above but most likely,the respective cutting step must be carried out with the sliver beingstopped. This, however, reduces the economy of operation. Finally, it isknown from DE-OS 17 60 857 to employ a cutting element in the form of achisel-shaped cutting knife which is cutting transverse to the directionof the sliver. The cutting knife is linearly inserted into a stretchedcutting channel by passing it through a sliver channel whereby thecutting channel is provided with upper and lower contact edges, in orderto avoid offset during the cutting step. This cutting knife is insertedin a sudden manner due to a supported piston-cylinder control unit. Thesliver is pulled via calender rolls. When the sliver is separated fromthe rolls a further transport is not ensured. A breakdown is the result.

It is therefore an object of the present invention to provide a cancoiler with a sliver cutting device which does not have any negativeeffects on the transport of the sliver so that the quality of sliver isnot negatively influenced and for which it is irrelevant whether theslubbing is a short fibered woven material of vegetable or animal originor, in particular, whether it is made of endless respectively longfilaments such as synthetic fibers.

SUMMARY OF THE INVENTION

According to the embodiments of the present invention a secure and fastcutting of the sliver is achieved. Negative effects such as theaforementioned jerking etc. do not occur. The sliver structure is notexposed to spontaneous loads. Therefore, the density of the sliver isnot disadvantageously influenced. Rather, a quiet and uniform feed isensured. Moreover, peak loads at the device are prevented. The devicemay therefore be of a compact design and may provide as well thepossibility to cut at full operation speed. All these features can beprovided by having a cutting element in the form of a cutting knife thesupport of which is such that, for the cutting step, the cutting bladeis inserted into the circular path by generating a pulling cut, wherebythe cutting knife, in the cutting position, extends to a radial line ofthe circular path whereby the radial line is essentially vertical to thecutting edge of the cutting knife. The cross section of the sliver thusdoes not contact the cutting edge at an obtuse angle, but due to cuttingin a pulling manner, the cutting effect is distributed over the angle ofrotation so that the cutting effect is only slowly increased. The sliveris guided onto a continuously rising cutting ramp. Furthermore, thesliver is rotated under the cutting effect due to the rotation of thecan coiler turntable. The sliver is cut in a clean manner. It isfurthermore suggested that the blade of the cutting knife is supportedwith one end at a vertical bolt and is thus pivotable at the machineframe. For moving the blade a drive device is provided. The respectivepivotability of the blade favors the use of a very short actuationstroke by utilizing the lever effect. The blade can be inserted andretracted in a sudden manner. It is advantageous to provide the drivedevice in the form of a piston/cylinder unit the piston rod of whichengages, spaced at a distance from the pivoting axis of the cuttingknife, engages the cutting blade, whereby the cutting knife. In itscutting position, extends to a radial line of the circular path of thesliver, with the radial line being essentially vertical to the edge ofthe cutting knife. In order to reduce the time of the covering of theoutlet channel, i.e., freeing the outlet channel after the cutting hastaken place as soon as possible, the embodiment is characterized byhaving an acute angle between the edge and the head surface of thecutting knife which extends in the circumferential direction of thesliver path. The respective undercut may be chosen at such a great anglethat, when cutting the last fibers, more than two thirds respectivelyalmost the entire cross section of the outlet channel is already open.Furthermore, it is advantageous that the piston rod of thepiston/cylinder unit is arranged approximately parallel to the radialline, i.e., that it extends essentially vertical to the edge of thecutting knife. This results in an optimized actuation direction withrespect to the occurring forces. A further advantageous embodiment isprovided with a limit switch that activates the piston/cylinder unit andwhich receives its impulse from a trip switch located at the turntablerespectively turning ring. Furthermore, in this context, it isadvantageous that the cutting device is activated depending on theactivation of the limit switch and the position of a can for receivingthe sliver. This will assure a fully automated operation with nolow-quality products. An advantageous alternative solution of thecutting knife arrangement according to the present invention comprises acutting knife in which the edge that provides the pulling cut isarranged on the outer side of the cutting knife that is spaced fartherapart from the center of the circular path, whereby the tip of thecutting knife points against the direction of rotation. The sliverpasses through an essentially hook-shaped cutting device. The sliverforcefully passes the edge. None of the fibers can reach an offsetposition. A further advantages of this version is that the cuttingpressure is not applied against the pressure medium of thepiston/cylinder unit, but is absorbed by the rigid end positionabutments of the cylinder. A further advantage of this solution is alsothat the fiber and dust remains are removed from the groove via theinserted cutting knife. The cutting knife thus is working in a shovellike or plow-like manner and functions in a self-cleaning fashionwhereby the removal of the aforementioned remains is additionallyassisted by centrifugal forces. It is also advantageous that the cuttingknife at its free end is pointed. Accordingly, there is no need for anespecially deep transverse groove to be cut into the turntable. Underconsideration of the space requirements for the pivoting action of thecutting knife, one specific embodiment has been proven to beadvantageous whereby the angle of the pointed end of the cutting knifeis 10° and the angle of the side of the cutting knife that is facing thecenter point of the circular path, in its cutting position, is 90°relative to the radial line.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will now be described in detail in the followingparagraphs with the aide of an embodiment represented in the drawings inwhich:

FIG. 1 shows a can coiler of the present invention in the form of alinear changer in a perspective representation,

FIG. 2 is a vertical cross section of the can coiler representing theinventive sliver cutting device with a retracted cutting knife,

FIG. 3 shows an enlarged view of the sliver cutting device with acutting device in its cutting position,

FIG. 4 is a schematic plan view of FIG. 3,

FIG. 5 is a representation according to FIG. 4 enhancing a movementstudy of circular path of the outlet channel with the cutting knifebeing in a cutting position,

FIG. 6 shows the same representation during the cutting step but showingthe cover that is marked in a cross hatched manner during the cuttingstep,

FIG. 7 is a plan view of the turntable of the can coiler showing thedrive of the calender rolls,

FIG. 8 is a schematic plan view of a linear changer,

FIG. 9 shows the placing of the sliver in a cross sectional view and

FIG. 10 is a view of a variant of the cutting knife showing the insertedposition of the cutting knife represented in a dotted dashed line.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The can coiler 1 integrated in a linear changer has a turntable 2. Thelatter rotates in the direction of the arrow X.

Via the turntable 2 a sliver 3 transported towards the can coiler 1 isdeposited into the can 4. The latter stands on a rotary plate 5 at thebottom 6 of the can coiler 1 The deposition takes place in a circularand rising manner whereby due to the rotation of the turntable 2, havingan opening 7 for the sliver 3 that is disposed in an eccentric manner atthe turn-table 2 a coiled arrangement results, as shown in FIG. 8. Theopening 7 is formed by a nozzle 8 that opens in an upward direction in afunnel-shaped manner. In a vertical downward direction an outlet channel9 communicates with the nozzle 8 whereby the outlet channel 9 ispartially formed by the material of the turntable 2 and partially formedby a tube 10 that is arranged above.

The end section of the nozzle 8 which points in a downward directionextends deep down into the wedge between two calender rolls 11. Thecalender rolls 11 which are supported at the pot-shape turntable 2 pullthe sliver 3 in a downward direction and push it through the smoothoutlet channel 9 onto the bottom side of the can coiler head.

The upper end of the tube 10 is shaped correspondingly to thecylindrical calender roll contour.

The drive of the calender rolls 11 results from the rotation movement ofthe turntable 2. This drive is realized in the form of a belt drive. Thecomponents of the belt drive are arranged, as are the calender rolls, inthe pot-shaped space of the turntable 2 which is provided at its upperend with a lid 12.

The rotational movement is transformed via a friction wheel 13. Thefriction wheel 13 rolls on an inner annular surface 14' of a stationaryannular body 14 that is arranged at the can coiler head. The frictionwheel 13 is loaded by the belt tension in the direction of contact. Thefriction wheel 13 is located on a guide 15. The guide 15 is pivotableabout an axis 16. The axis 16 extends from the bottom 2' of thepot-shaped turn table 2. The side wall of the pot is designated by thereference numeral 2". The pivoting axle which carries the friction wheel13 is designated by the reference numeral 17. The pivoting axle 17extends in an upward direction in order to attach thereto a belt pulley19 that transmits the rotational movement of the friction wheels 13 tothe drive belt 18. In addition to the belt pulley 19 the belt driveencompasses a total of six further guide pulleys. One of the guidepulleys (designated by reference numeral 20) is located at the centerpoint M of the turntable 2. Two further ones, as the belt pulley 19, arearranged at the circumference of the turntable 2 and are designated byreference numeral 21. The three remaining belt pulleys 22, 22 and 23 arearranged along the connecting line Z--Z which corresponds to theshortest connection of the two belt pulleys 21 that are arranged on thecalender roll side of the apparatus, whereby the belt pulleys 22, 22 and23 are arranged on axes parallel to the turntable plane such that twobelt pulleys 22, 22 are disposed on either side of the belt pulley 24that is arranged on the calender roll axis 11'. Thereby a V-shapedfolding of the belt section resulting in an optimum slip-free guidanceof the belt 18 is achieved. The respective 90° twisting of the belt iswell represented in FIGS. 2 and 7.

The lower portion of the can coiler head is embodied as a centrallysupported disc 25. The disc 25 is freely rotatable and coincides withthe bearing axis of the central belt pulley 20 and may have a flat,slightly dome-shaped bottom.

The outer annular surface 14" that is opposite the inner annular surface14' of the annular body 14 receives a wire coil bearing 26 via which theturntable 2 is supported by a bearing ring 27 at the can stock head.

As can be seen in FIG. 2, the friction wheel 13 penetrates a window 2'''in the mantle wall of the pot-shaped turntable 2.

In order to interrupt the sliver 3 for the can exchange, a cuttingdevice TV is provided in the area of the can coiler head at the cancoiler 1. The cutting device is provided with a cutting knife 28. Thesupport of the cutting knife 28 is embodied such that the cutting edge28', for the cutting step, is introduced into the circular path U of theoutlet channel 9 in a direction transverse to the longitudinal extensionof the sliver 3, thus reaching a cutting position. In order to reachthis cross sectional area the turntable 2, at the lower side of itsbottom 2', is provided with a horizontally extending transverse groove29. The transverse groove 29 is continuously rolled and is located at athicker portion 30 of the bottom 2', protruding in a downward directionand shaped like an annular flange. The thicker portion 30 correspondsapproximately to the thickness of the turntable bottom 21 at its innerside. The thicker portion 30 also serves to partially the verticallyextending cylindrical outlet channel 9.

It can be taken from the drawings that the sliver cutting device TV isarranged lateral to the periphery of the turntable 2 having the outletchannel 9.

The blade of the cutting knife 28 is pivotable at one end about avertical bolt 31. The bolt 31 is in the form of a stay bolt whichextends from the machine frame, in this case from the pressure plate 32of the can coiler head.

The cutting knife 28 is moved back and forth with the aid of anelectrically or electronically controlled drive device 33 from itsresting position into the cutting active position. For this purpose adrive device is provided which is realized as a pneumaticpiston/cylinder unit. The piston rod 34 engages, spaced at a distancefrom the pivoting axis (vertical bolt 31) of the cutting knife 28, in ajoint-like manner. The engagement is achieved in an indirect manner dueto the interposition of an angular actuating member 35 which is formedfrom sheet material. The longer leg slides on the upper side of thepressure plate 32 and extends into the relatively small slot area Spbetween a rim section of the bottom 2' of the turntable 2 and thesomewhat elevated annular body 14. The shorter vertical leg of theactuating member 35 represents the attachment for the free end of thepiston rod 34. The piston rod 34 is provided with an outer thread 36.Two nuts 37 permit a fine adjustment of the actuating member 35 for theexact positioning of the cutting knife 28.

The joint bolt between the actuating member 35 and the cutting knife 28is designated by the reference numeral 38 and is positionedapproximately at half the length of the blade whereby it is positionedslightly backwards relative to the back of the blade. In a stationarypiston/cylinder unit, a slotted hole embodiment in this area wouldprovide the necessary compensation for the required movement; it ishowever sufficient, that the cylinder 39 of the drive device 33 issupported in a pivotable manner about a vertical axis. This alternative,however, is not represented. It is preferred to employ the firstmentioned coordination providing a respective stationary position of thecylinder 39 on a vertical support 40 that is connected to the pressureplate 32.

Considering the secant-like position of the cutting knife 28 in itscutting position, moved toward and essentially tangent to the circularpath, an essentially vertical alignment of the blade 28' with respect toan imaginary radial line of the turntable 2 results, whereby the radialline R intersects the cutting knife end 28". In the shown embodiment therespective angle α between the radial line R and the edge 28' is 95°. Inthe disengaged position the respective angle is approximately 82°. Thehead surface 28"' of the cutting knife 28, is slanted in a directionopposite to the circumferential direction X. The respective acute angleβ, with respect to the radial line R as a basis, is approximately 15°.Due to this slanted portion the area F of coverage in the cutting stepis shortened. The area F of coverage in FIG. 6 is represented in acrosshatched manner. The outer border of the area F of coverage isdetermined by the circular borders of the circular path U on the oneside and the inner border of the area F of coverage is limited by theedge 28'.

The piston rod 34 extends essentially parallel to the radial line R.

The immersion of the sliver cross section (defined by the circular crosssection of the outlet channel 9) into the cutting zone of the cuttingknife 28 is clearly shown in FIG. 5. The movement study representedtherein shows the first point of contact of the knife at position a. Thedirection of transportation is essentially at an acute angle. The crosssection of the sliver passes over the edge 28' which is facing in thecenter of the circular path U and is, after passing a distance of aboutone and a half times the dimension of the outlet channel cross section,semi-compressed and partially cut (position b). After a further travelin the direction of the arrow X for about the same amount, the crosssection of the sliver is out almost entirely (position c). Only in thefollowing, very short phase a complete coverage of the outlet channelcross section occurs. Subsequent to this position d the outlet channelcross section is freed. The sections that are respectively covered bythe blade are provided with a transport free section in the positions ato c, in which the partial cross section of the sliver 3 is furthertransported by the calendar rolls 11. The structure is also determinedby the sliver 3 being rotated relative to the edge 28'. This rotationand the extreme acute transport of the sliver cross section to the edge28' results in an optimum cutting process.

The exact timing of the insertion of the cutting knife 28 is realized ina motion-dependent control respectively tripping, especially via a limitswitch 41 activating a piston/cylinder unit (compare FIG. 3). The limitswitch 41 receives its impulse from a trip switch 42 that is arranged atthe turntable. This trip switch 42 and/or the limit switch 41 may beexactly positioned. The trip switch 42 is provided with a radial slottedhole, which is penetrated by the shaft of a holding screw 43. Thissliver cutting device TV is actuated depending upon the activation ofthe limit switch 41 and the position of the can 4, which is monitored bya respective switch or sensor, for receiving the sliver 3. (This will beexplained in detail in the following paragraphs). The control of thecutting process thus is achieved in an electric manner. It may also becomputer-controlled.

In the following, the activation of the sliver cutting device TV underconsideration of the position of the opening 7 and the position of thecan 4 will be explained, whereby the position of the filled can 4 or theposition of a can 4 to be filled in the following cycle will be thebasis.

The can exchange is achieved via the device represented in detail inFIG. 1, having a path 45 for the cans 4 which are represented by adash-dotted line, and border on one side a console 46. Between the faces47 and 48 of the console 46 a can moving unit 49 is disposed. The canmoving unit 49 is provided with a piston/cylinder arrangement 56, apolygon profile 57, a carrier 53 which is slidable in a longitudinaldirection on the polygon profile 57 but is non-rotatable, as well asarms 44 that are attached to the carrier 53. The piston rod 58 of thepiston/cylinder unit 56 engages with its free end a latch 59 of the canmoving unit 49. While the piston rod 58 is non-rotatably connected tothe latch 59, the ledge 59 is supported rotatably but non-slidably atthe carrier 53. The faces 47 and 48 are provided with respectivebearings 50 which support the polygon profile 57. Via a furtherpiston/cylinder unit 51 the polygon profile 57 is pivotable via apivoting lever 52 so that the arms 44 attached to the carrier 53 may bemoved from a downwardly pointing vertical position into a liftingposition (according to FIG. 1) and vice versa. The arms 44 are spaced ata distance from one another which corresponds approximately to the outerdiameter of a can 4.

In the horizontal moving path of the carrier 32, an electric switch 54is arranged which is only schematically represented manner. Also, thetwo end sections of the cylinders of the piston/cylinder unit 56 areprovided with a respective end switch 60 respectively 61 which are alsoonly schematically represented. The switches 54, 60 and 61 are triggeredcorresponding to the movement end position of the carrier 53 and may beactuated mechanically or by approaching (preferably Reed contacts areemployed which are actuated by magnetic pistons of the piston/cylinderunit 56). The switch 54 is slidably supported in the direction of thedouble pointed arrows 55 and can be fixed in a desired position. Therebythe response with respect to the position of the can sliding unit 49 canbe adjusted. The end switch 60 and 61 have the task to monitor thehorizontal sliding path of the can moving unit 49. The end positionscorrespond to the receiving position of a new, not yet filled can 4,respectively the displacement position corresponding to the rotary disc5.

The device works as follows: The piston/cylinder unit 56 and 51 aresupposedly in a position represented in FIG. 1 whereby the can 4 on therotary disc 5 is to be filled with sliver. During this filling processthe piston/cylinder unit 51 is controlled such that the polygon profile57 is rotated about the bearing 50 so that the arms 44 are moved intotheir vertically downwardly directed position. Subsequently, triggeredby a control unit which is not represented in the drawing, the carrier53 is moved into the direction of the face 48 until a position whichcorresponds to the waiting empty can 4 is reached. This movement isrealized via a piston/cylinder unit 56 whereby the transmission offorces is achieved via the piston rod 58 and the latch 59. Then the arms44 are adjusted into their lifting position via the piston/cylinder unit51 so that they receive between them the empty can 4. When it isdetermined by suitable means (for example, by counting the canrevolutions) that the can 4 which is undergoing the filling step isapproaching its filled state the control unit initiates a movement ofthe piston of the piston/cylinder unit 56 in the direction of the face47 so that the piston rod 58 and the latch 59 transport the carrier 53,and thus via the arms 44, the can 4 to be filled, whereby the filled can4 is moved to the right hand side away from the device (FIG. 1). Thehorizontal movement of the arms 44 is carried out to a point where thenew can 4 reaches its position on the rotary disc 5. During thismovement the switch 54 is actuated which achieves a kind of "focusing".This means, that, at the moment when the limit switch 41, due to theapproach of the switch 42, is activated and, at the same time, thefocusing via the switch 54 is achieved, the drive device 33 receives atriggering impulse. Now the cutting knife 24 is moved into a cuttingposition. The retraction of the knife is actuated depending on therotating speed of the opening 7, i.e., as previously explained, in aninterval relative to the insertion of the knife which is smaller or atmost equal to the rotation time of the opening 7.

It is clear from the previous explanations that the exact time of thesliver cutting can be adjusted via the positioning of the switch 54along the double pointed arrows 55. The position of the switch 54determines the positions of the can 4 that is filled or is to be filledat the time of the cutting process.

It is thus possible to perform a cut at a moment when the can 4 whichhas been filled has already left the rotary disc 5. The result is thatthe end of the sliver 3 extends passed the filled can. At the same time,this cutting moment results in the insertion of the beginning of thefurther fed sliver into the new can 4 to be filled, so that the sliverdoes not protrude from the can. If the moment of the cutting step ischosen to be at an earlier time when the filled can has not yetcompletely left the rotary disc 5, a constellation results in which theend of the sliver of the can to be filled as well as the end of thesliver of the can to be filled will protrude past the rim of the can. Afurther advancement of the cutting moment relative to the position ofthe cans can be realized such that the end of the sliver of the filledcan will come to rest on the sliver support thereby not protruding fromthe can, while the formed sliver beginning will extend past the rim ofthe can 4 to be filled. Corresponding to the desired requirements thelength of the protruding sliver ends respectively the position of thesliver ends or beginnings relative to the respective may be adjusted.

It is especially advantageous that due to the inventive cutting of thesliver the revolving speed of the opening 7 during the cutting steprespectively during the can exchange must not be reduced. This resultsin an expedient operation. Furthermore, the constant revolving speed ofthe opening 7 (and therewith the constant delivery speed of the sliver3) ensures that no production or quality loss will occur.

A further advantage is that the cutting knife 28 is provided in anexchangeable manner so that when a blade becomes dull respectively whena blade breaks, quick relief may be provided.

The present invention is not restricted to the linear exchanger for cans4 as represented in FIG. 1 but may, for example, also be used withso-called revolving exchangers. In such revolving exchangers, the cans 4are not linearly guided but are guided on a circular path.

The variant of the inventive cutting knife 28 as represented in FIG. 10realizes the same advantageous principal with respect to the pulling cutas explained for FIGS. 1 to 9. The reference numerals, when structuraland functional identity is provided, are used for the same parts wherebyrespective identical portions of the text are not repeated. In contrastto the aforementioned embodiment, the edge 28' of the cutting knife 28is arranged on the outer side of the circular path U, i.e., is pointingaway from the aforementioned center.

Also, with respect to the support and the control of the cutting knife,a reverse order is provided whereby the tip of the cutting knife 28",i.e., the free end of the cutting knife 28, is directed counter to thetransport direction X. This results in the consequence that the sliver3, when the cutting knife 28 is introduced into the circular path U, isforced over the blade 28'. The cutting knife 28 thus engages in ahook-like manner the transverse groove. All of the fibers are cut andnone of the fiber sections can reach an offset position.

The cutting knife 28 which is also pivotable about a stationary pivotingpoint 31 is finely adjustable via a respective adjustable carrier of avertical bolt 31 that is forming the pivoting axis. Directly adjacent anactuating member 35 extends essentially parallel, which has beendescribed in detail in the paragraphs set forth above and is moved viasaid piston/cylinder unit. It is thereby of interest that the cuttingpressure acting on the edge 28' of the cutting knife 28 is no longeracting on the medium which is loading the piston of the piston/cylinderunit. The cutting pressure is merely absorbed by the rigid end abutmentof said cylinder. In order to achieve a relatively small pivoting strokethe free end of the cutting knife 28 is tapered off at an acute angle.The respective acute angle is approximately 10° whereby the side of thecutting knife facing the center point of the circular path U in itscutting position together with the radial line (FIG. 10) encloses anangle of approximately 90°. Thus, a relatively short working stroke ofthe piston/cylinder unit is sufficient. The pointed end of the knife istapered in a continuous manner and the tapering begins already at thearea of the joint bolt 38. The tapering also provides an extreme headsurface undercut 28"' which frees almost completely the cross section ofthe sliver in the freed direction (direction of transport) of the sliverright from the beginning.

Due to the hook-like respectively shovel-like or plow-like position ofthe cutting knife 28, the advantage results that due to means alreadypresent, a removal device for fiber and dust particles collecting in thetransverse groove 29 is provided. The fiber and dust particles arespontaneously removed. It is also possible to provide in this area avacuuming device for the removal of the particles which is notrepresented in the drawings.

The non-cutting position of the cutting knife 28, i.e., the retractedposition, is represented in FIG. 10 in a dash-dotted line.

The features of the invention as disclosed in the above description, thedrawings and the claims may be taken individually or in any desiredcombination for the realization of the present invention.

The present invention is, of course, in no way restricted to thespecific disclosure of the specification and drawings, but alsoencompasses any modifications within the scope of the appended claims.

What I claim is:
 1. In a can coiler with an outlet channel fordelivering a sliver to a can, said outlet channel being fastened to arotating turn table and following a circular path, and with calenderrolls, for transporting said sliver, being rotatably fastened to saidturntable upstream said outlet channel, and having a sliver cuttingdevice with a cutting element that is movable, transverse to alongitudinal direction of said sliver, into and away from said circularpath of said outlet channel and into and out of a peripheral groovecomprised by said turn table, the improvement wherein:said cuttingelement consisting of a cutting knife with a blade and a cutting edgefor a cutting process, said process consisting of a pulling cuttingaction, said knife being moved into said circular path into a cuttingposition so as to cut the sliver, with said cutting edge in said cuttingposition extending to a radial line of said circular path, said radialline being essentially perpendicular to said cutting edge.
 2. The cancoiler according to claim 1, wherein said blade of said cutting knifehas a portion pivotably supported by a vertical bolt and has anotherportion connected to a drive means for displacing said blade, whereinsaid drive means comprises a piston/cylinder unit with a piston rod,said piston rod being spaced from said bolt and connected to anactuating member for actuating said cutting knife.
 3. The can coileraccording to claim 2, wherein said piston rod extends approximatelyparallel to said radial line and essentially perpendicular to saidcutting edge.
 4. The can coiler according to claim 2, further comprisinga limit switch for actuating said piston/cylinder unit and a trip switchfastened to said can coiler, said limit switch receiving an impulse fromsaid trip switch, with said sliver cutting device being activated inresponse to an actuation of said limit switch and a rotational positionof the can for receiving said sliver.
 5. The can coiler, according toclaim 1, wherein an acute angle is formed between said cutting edge anda head portion of said cutting knife, with said head portion positionedin a direction of rotation of said turn table.
 6. The can coileraccording to claim 1, wherein said cutting edge providing said pullingcutting action is located on a side of said cutting knife facing outwardand away from a center of said circular path and a free end of saidcutting knife is positioned against a direction of rotation of said turntable.
 7. The can coiler according to claim 6, wherein said free end ofsaid cutting knife is tapered.
 8. The can coiler according to claim 7,wherein an angle of tapering is approximately 10° and a side of saidcutting knife that is facing said center of said circular path, in acutting position thereof, encloses an angle of approximately 90° with aradial line of said circular path.